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Newton’s Law of Gravity
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Slide 1

Newton’s Law of Gravity

Slide 2

Bit of Administration ….

Bit of Administration ….

6-Week Test

Monday, March 1, 7:15-8:30, 3425 Sterling

56 multiple choice questions

2/3 conceptual use of the material

1/3 recall

All material in lecture, discussion, homeworks

through today; readings on that material

Review Session

Sunday, February 29, 6:30-7:30, 3425 Sterling

Will answer questions, no new presentations

Slide 3

Newton’s Law of Gravity

Newton’s Law of Gravity

1

2

Fg

Fg

M1 = Mass of object 1 (grams)

M2 = Mass of object 2 (grams)

D = Distance between objects (cm)

G = 6.67x10-8 cm3/sec2/gm

Slide 4

Newton’s Law of Gravity

Newton’s Law of Gravity

Galileo’s Experiment

Lead

Wood

Earth

Fg,lead

Fg,wood

alead

awood

Slide 5

Newton’s Law of Gravity

Newton’s Law of Gravity

Mass = Amount of Material

Weight = Force Due to Gravity

Slide 6

On much of the European continent, the heft of people is called their mass and measured in kilograms. Like in the United States, they measure themselves by stepping on a bathroom floor scale.

On much of the European continent, the heft of people is called their mass and measured in kilograms. Like in the United States, they measure themselves by stepping on a bathroom floor scale.

True or False: Strictly speaking, when they step on the scale they are not measuring their mass but instead are measuring their weight.

A) True

B) False

C) Its debatable

ConcepTest!

Slide 7

Newton’s Law of Gravity

Newton’s Law of Gravity

“Weightlessness”

200 lbs

Slide 8

Newton’s Law of Gravity

Newton’s Law of Gravity

?

Slide 9

After jumping off the building (and before landing!), what weight will the scale read?

After jumping off the building (and before landing!), what weight will the scale read?

A) 0 pounds

B) 20 pounds

C) 200 pounds

D) 300 pounds

ConcepTest!

Slide 10

Newton’s Law of Gravity

Newton’s Law of Gravity

“Weightlessness” - No such thing; would imply no gravity

- A consequence of all object in free fall

at same acceleration

0 lbs

Slide 11

Newton’s Law of Gravity

Newton’s Law of Gravity

Orbits

Slide 12

Newton’s Law of Gravity

Newton’s Law of Gravity

Orbits

Slide 13

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